Constituted 23 November 1943 in the Army of the United States as the 173d Army Postal Unit

Activated 27 December 1943 at Fort Leonard Wood, Missouri

Inactivated 15 June 1946 in Germany

Redesignated 20 October 1947 as the 394th Army Postal Unit and allotted to the Organized Reserves

Activated 17 November 1947 at Grand Rapids, Michigan

(Organized Reserves redesignated 25 March 1948 as the Organized Reserve Corps; redesignated 9 July 1952 as the Army Reserve)

Inactivated 17 November 1950 at Grand Rapids, Michigan

Activated 19 September 1956 at Flint, Michigan

Location changed 4 January 1960 to North Judson, Indiana

Inactivated 15 March 1972 at North Judson, Indiana

Redesignated 30 August 1994 as the 394th Adjutant General Company

Activated 16 October 1995 at Fergus Falls, Minnesota

Location changed 7 December 1999 to Long Beach, California

Ordered into active military service 7-10 February 2003 at Long Beach, California; released from active military service 14 June 2004 and 15 August 2004 and reverted to reserve status

Ordered into active military service 10 September 2004 to 4 October 2005 at Long Beach, California; released from active military service 2 January 2006 to 10 January 2007 and reverted to reserve status